A moisture-proof and waterproof environment-friendly decorative cloth and a preparation process thereof

Abstract

The present application belongs to the technical field of decorative cloth, and particularly relates to a moisture-proof and waterproof environment-friendly decorative cloth and a preparation process thereof. The moisture-proof and waterproof environment-friendly decorative cloth comprises a decorative cloth and a modified polyurethane coating, and the modified polyurethane coating is formed by coating modified polyurethane coating liquid on the decorative cloth; the modified polyurethane coating liquid is obtained by adding a trihydric alcohol to the raw material, so that a side chain is introduced on the molecular chain of the water-based polyurethane, and then a silicon-oxygen group is introduced on the side chain; in the polyurethane coating film formation, the silicon-oxygen group side chain is gathered on the surface of the polyurethane coating, the waterproof performance of the coating is enhanced, and the decorative cloth with the polyurethane coating has excellent waterproof, moisture-permeable and moisture-proof performances.

Description

Technical Field

[0001] This invention belongs to the field of decorative fabric technology, and in particular relates to a moisture-proof, waterproof and environmentally friendly decorative fabric and its preparation process. Background Technology

[0002] With social progress and economic development, people have put forward more and higher requirements for fabrics, and have placed greater emphasis on comfort, health and multifunctionality, which has promoted the development and research of new fabrics.

[0003] Chinese utility model patent CN210362759U discloses a moisture-proof and waterproof environmentally friendly decorative fabric. This fabric comprises a film layer, a decorative fabric, a polyurethane coating, a bamboo charcoal layer, and a base layer. The film layer, made of polyvinyl chloride, isolates moisture from the front of the decorative fabric, preventing water from splashing onto it. The polyurethane coating, located on the back of the decorative fabric, isolates moisture from the fabric when the wall is damp, preventing contact between the moisture and the fabric and improving the situation where the decorative fabric tends to mold over time. However, while this decorative fabric is waterproof, it is not breathable, and walls covered with it are prone to mold growth after prolonged use, leading to the fabric peeling off. Summary of the Invention

[0004] To address the issue that traditional decorative fabrics often lack both waterproof and moisture-proof properties, this application provides a moisture-proof, waterproof, and environmentally friendly decorative fabric and its preparation process.

[0005] In the first aspect, this application provides a moisture-proof, waterproof, and environmentally friendly decorative fabric, which adopts the following technical solution: A moisture-proof, waterproof, and environmentally friendly decorative fabric includes a decorative fabric and a polyurethane coating, wherein the polyurethane coating is formed by applying a modified polyurethane coating liquid onto the decorative fabric; The modified polyurethane coating liquid, by weight, comprises the following raw materials: Isocyanate 211-635 parts; Diols 46-900 parts; 12-81 parts of triol 32-39 parts of polyhydroxycarboxylic acids; The first chain extender is 7.2-85.1 parts; 180-300 parts of hydroxyl-terminated polydimethylsiloxane; The second chain extender is 7.2-85.1 parts; Triethylamine 23-27 parts; 50-80 parts acetone; 1000-2000 parts water; The polyhydroxycarboxylic acid is dimethylolpropionic acid or dimethylolbutyric acid; The molar ratio of the isocyanate group to the hydroxyl group in the polydiol, triol, and dimethylolpropionic acid is (1.2-1.6):1. The preparation steps of the modified polyurethane coating liquid are as follows: Preparation of polyurethane prepolymer: Diol and triol are mixed to form a mixture. The temperature of the mixture is raised to 70-90℃, and isocyanate is added under nitrogen protection and stirring at 300-500r / min. The reaction is carried out for 0.6-1.2h to obtain polyurethane prepolymer. Grafting reaction: Hydroxyl-terminated polydimethylsilane and a first chain extender are added to the polyurethane prepolymer, and the reaction is continued to be stirred for 0.6-1.2 h to prepare the modified prepolymer; Salt formation: Add polyhydroxycarboxylic acid to the modified prepolymer, stir and react for 1.5-2.5 h, then lower the temperature to 40-50℃, add acetone, then add triethylamine, and react for 0.5-1 h to prepare the modified prepolymer salt; Emulsification: Water was added to the prepared modified prepolymer salt under stirring at 1000-1500 r / min to prepare a modified prepolymer emulsion. Chain extension reaction: Add a second chain extender to the modified prepolymer emulsion, raise the temperature to 70-90℃, and react for 0.5-1h under stirring at 300-500r / min to prepare the modified polyurethane coating liquid.

[0006] Preferably, the average molecular weight of the hydroxyl-terminated polydimethylsiloxane is 1000-1500.

[0007] The above technical solution involves polymerizing hydroxyl-terminated polydimethylsiloxane, polydiol, and isocyanate to create silicon-oxygen bonds in the molecular chain of waterborne polyurethane. These silicon-oxygen bonds give the polyurethane hydrophobic properties.

[0008] Polyurethane is composed of repeating soft and hard microphase regions. The hard microphase regions are composed of urethane bonds with strong cohesion. At room temperature, these hard microphase regions are glassy subcrystalline or microcrystalline, giving the polyurethane coating good mechanical properties, such as hardness and abrasion resistance. The soft microphase regions are formed by the aggregation of polyether or polyester segments, giving the polyurethane coating elasticity and low-temperature performance. The polyether or polyester in the soft microphase regions can maintain a certain degree of flexibility at room temperature. There are some tiny gaps between the molecular chains of the soft microphase regions. When there is a water vapor pressure difference on both sides of the polyurethane coating, the polyether or polyester combines with water molecules and transfers water vapor from the side of the polyurethane coating with higher relative humidity to the side with lower relative humidity through the tiny gaps in the soft microphase regions, giving the polyurethane coating breathable and moisture-proof properties.

[0009] If ordinary water-based polyurethane is used as the coating for decorative fabric, the coating has breathable and moisture-proof properties, but ordinary water-based polyurethane is not waterproof enough. If water droplets remain on the ordinary polyurethane coating for a long time, water molecules will penetrate into the interior of the decorative fabric through the soft segment microphase region of polyurethane, resulting in poor waterproof performance of the decorative fabric with ordinary polyurethane coating.

[0010] In this application, by adding triols to the reaction of waterborne polyurethane, side chains are introduced into the molecular chain of waterborne polyurethane, and then siloxane groups are introduced into the side chains. During the film formation process of the modified waterborne polyurethane, due to the hydrophobic properties of siloxanes, the siloxane side chains rotate towards the side of the coating away from the decorative fabric, causing the siloxane side chains to gather on the surface of the modified polyurethane coating, which plays a waterproof role. As a result, the decorative fabric with the modified polyurethane coating has excellent waterproof, breathable and moisture-proof properties.

[0011] Compared to oil-based polyurethane, water-based polyurethane reduces the amount of organic solvents used, making it more environmentally friendly. Furthermore, decorative fabrics with polyurethane coatings release almost no organic solvents during use, making them more environmentally friendly and healthier.

[0012] Preferably, the triol is one of polycaprolactone triol, polyoxyethylene glycerol ether, and glycerol; the first chain extender and the second chain extender are ethylenediamine or isophorone diamine.

[0013] Through the above technical solution, by adding triol during the synthesis of waterborne polyurethane, the waterborne polyurethane has a branched structure. Siloxane groups are connected to the branched chains by a first chain extender, reducing the number of siloxane groups connected to the main chain of the polyurethane. This reduces the impact of the hydrophobic properties of the siloxane groups on the water absorption properties of the soft segment microphase region on the main chain of the polyurethane, and enhances the waterproof and breathable effect of the siloxane groups in the polyurethane.

[0014] The first and second chain extenders are chain extenders that increase the molecular weight of polyurethane molecules.

[0015] Preferably, the triol is polyoxyethylene glycerol ether.

[0016] Through the above technical solution, the preferred triol is polyoxyethylene glycerol ether. Since the molecular structure of polyoxyethylene glycerol ether has three relatively long branches, the rotational steric hindrance is small. Each branch contains ether bonds, which makes it easier for the side chains of waterborne polyurethane to rotate. This makes it easier for the side chains containing siloxane groups to aggregate on the surface of the modified polyurethane coating during the film formation process, thereby improving the waterproof performance of the modified polyurethane coating.

[0017] Preferably, the isocyanate is one of diphenylmethane diisocyanate, dimethylbiphenyl diisocyanate, and hexamethylene diisocyanate; the diol is one of polyethylene glycol, diethylene glycol, polytetrahydrofuran glycol, 1,2-propanediol, 1,5-pentanediol, and 6-hexanediol.

[0018] Through the above technical solution, isocyanate provides hard segment microcrystalline regions for modified waterborne polyurethane molecules, enabling the modified waterborne polyurethane to have excellent mechanical properties, such as washability.

[0019] Diols provide soft-segment microcrystalline regions for modified waterborne polyurethane molecules, giving the modified polyurethane coating flexibility and low-temperature performance. The soft-segment microcrystalline regions are moisture-absorbing areas in the polyurethane molecules, giving the polyurethane coating breathable and moisture-proof properties.

[0020] Preferably, the isocyanate is diphenylmethane diisocyanate; and the diol is polyethylene glycol.

[0021] Preferably, the average molecular weight of polyethylene glycol is 1000-2000.

[0022] Through the above technical solution, polyethylene glycol has more ether bonds, which gives it a stronger ability to bind water molecules. In addition, the polyethylene glycol molecular chain is longer, and the soft segment microcrystals are more flexible, thereby enhancing the breathability and moisture-proof performance of the modified polyurethane coating.

[0023] If the molecular weight of polyethylene glycol is too low, its breathability and moisture-proof performance will be insufficient; if the molecular weight of polyethylene glycol is too high, the strength and abrasion resistance of the modified polyurethane coating will be insufficient.

[0024] The molecular chain of diphenylmethane diisocyanate is attached with a large molecular group phenyl. The phenyl increases the gap between the modified polyurethane molecules, making it easier for the side chains containing siloxane groups to rotate, move, and aggregate on the surface of the modified polyurethane coating during the film formation process, thereby improving the waterproof performance of the modified polyester film.

[0025] The phenyl group of dimethyl biphenyl diisocyanate is further connected to a methyl branch, which may hinder the movement of the siloxane group.

[0026] Preferably, the raw materials of the modified polyurethane coating liquid further include 10-30 parts of filler and 10-20 parts of leveling agent, wherein the filler is one of diatomaceous earth, kaolin, and montmorillonite.

[0027] Through the above technical solution, the filler enters the soft segment microphase region, increasing the gaps between molecules in the soft segment microphase region; the filler is a porous material, which enhances the air permeability and moisture-proof performance of the modified polyurethane coating.

[0028] Porous fillers are inserted between polyurethane molecules to increase the intermolecular forces, thereby improving the breathability and moisture-proof properties of the modified polyurethane coating, as well as its washability.

[0029] However, if the filler content is too high, the movement of molecular chain segments in the soft segment microphase region is hindered, water vapor channels are blocked, and the air permeability and moisture-proof performance of the modified polyurethane coating decreases; if the filler content is too high, the filler hinders the movement of silicon-oxygen side groups during film formation, and the water resistance of the film layer decreases; if the filler content is too high, the interaction force between polyurethane molecules is weakened, and the scrubbing resistance of the modified polyurethane coating decreases.

[0030] Leveling agents promote the spreading of modified polyurethane coatings, facilitate the rotation of polyurethane molecule branches, improve the uniformity of modified polyurethane coatings, and enhance the waterproof, breathable, and moisture-proof properties of modified polyurethane coatings.

[0031] Preferably, the leveling agent is an organosilicon leveling agent, and the particle size of the filler is 48-58 μm.

[0032] Through the above technical solutions, silicone leveling agents can reduce filler agglomeration and improve filler dispersibility. As small molecules, silicone leveling agents migrate to the surface of the modified polyurethane coating during the film formation process of the modified polyurethane coating liquid, which is beneficial to improving the water resistance of the modified polyurethane film and further enhancing the waterproof, breathable and moisture-proof performance of the modified polyurethane coating.

[0033] If the particle size of the filler is too large, it will not easily penetrate into the gaps between molecules in the soft segment microphase region. If the particle size of the filler is too small, it will easily agglomerate. Both large and small particle sizes of the filler have an unsatisfactory effect on improving the air permeability and moisture-proof performance of the modified polyurethane coating.

[0034] Preferably, the silicone leveling agent is one of BYK-333, BD-3055, BD-3033, and BD-3053.

[0035] The above technical solutions, by selecting silicone-based leveling agents, further enhance the waterproof, breathable, and moisture-proof properties of the modified polyurethane coating.

[0036] Preferably, the decorative fabric is a cotton, polyester-cotton, wool-polyester, or wool-based fabric.

[0037] Through the above technical solutions, cotton, polyester-cotton, wool-polyester, or wool fabrics contain hydrophilic groups, which are more conducive to the rotation of the siloxane side chains of the modified waterborne polyurethane coating away from the decorative fabric during the film formation process. This allows the siloxane side chains to gather on the surface of the modified polyurethane coating, thereby improving the waterproof performance of the decorative fabric with the modified polyurethane coating.

[0038] Secondly, this application provides a process for preparing a moisture-proof, waterproof, and environmentally friendly decorative fabric.

[0039] A process for preparing a moisture-proof, waterproof, and environmentally friendly decorative fabric involves applying a modified polyurethane coating liquid onto the decorative fabric and then drying it at 40-60℃ for 10-15 hours to obtain a decorative fabric with a modified polyurethane coating. The thickness of the modified polyurethane coating is 0.2-0.3 mm.

[0040] By adopting the above technical solution, the modified polyurethane coating liquid is formed into a film on the decorative fabric to form a decorative fabric with a modified polyurethane coating. The decorative fabric with the modified polyurethane coating is environmentally friendly, moisture-proof, waterproof and washable.

[0041] In summary, this application has the following beneficial effects: 1. A moisture-proof, waterproof, and environmentally friendly decorative fabric includes a decorative fabric and a modified polyurethane coating. The modified polyurethane coating is formed by applying a modified polyurethane coating liquid onto the decorative fabric. The modified polyurethane coating liquid is formed by adding triols to its raw materials, thereby introducing side chains into the molecular chains of the water-based polyurethane, and then introducing siloxane groups onto the side chains. During the formation of the polyurethane coating film, the siloxane group side chains aggregate on the surface of the polyurethane coating, enhancing the waterproof performance of the coating, so that the decorative fabric with the polyurethane coating has excellent waterproof, breathable, and moisture-proof properties.

[0042] 2. By selecting appropriate diols, isocyanates and triols, the branches on the polyurethane molecular chains can migrate more easily to the surface of the modified polyurethane coating during the film formation process of the polyurethane coating liquid, thereby improving the waterproof performance of the decorative fabric with the modified polyurethane coating.

[0043] 3. The raw materials of the modified polyurethane coating liquid of this application also include fillers and silicone leveling agents. The fillers are one of diatomaceous earth, kaolin, or montmorillonite. The fillers enhance the water resistance, moisture resistance, and washability of the decorative fabric with the polyurethane coating. The silicone leveling agents can reduce the agglomeration of fillers and improve the uniformity of the modified polyurethane coating, further improving the waterproof, moisture-proof, and washability of the decorative fabric with the modified polyurethane coating. Detailed Implementation

[0044] Preparation Example 1 A modified polyurethane coating liquid, the raw material composition of which is shown in Table 1, is prepared as follows: Preparation of polyurethane prepolymer: Diols, triols, and hydroxyl-terminated polydimethylsiloxanes were dehydrated for 5 hours in a vacuum drying oven at 90°C and 0.1 MPa before use; polyhydroxycarboxylic acids were dried for 6 hours at 90°C; and triethylamine and acetone were soaked in 4A molecular sieves for two weeks before use.

[0045] Polydiol and triol were added to a reaction vessel and mixed to form a mixture. The temperature of the mixture was raised to 70°C, and isocyanate was added dropwise under nitrogen protection and stirring at 500 r / min. After the isocyanate was added, the reaction was carried out for 0.6 h to prepare polyurethane prepolymer. Grafting reaction: Hydroxyl-terminated polydimethylsilane and the first chain extender were added to the polyurethane prepolymer, and the reaction was continued to be stirred for 1.2 h to prepare the modified prepolymer; Salt formation: Then, polyhydroxycarboxylic acid was added to the modified prepolymer and stirred for 1.5 h; subsequently, the temperature was lowered to 40 °C, acetone was added and stirred for 10 min, then triethylamine was added and reacted for 1 h to prepare the modified prepolymer salt. Emulsification: Water was added to the modified prepolymer salt under stirring at 1500 r / min to prepare a modified prepolymer emulsion. Chain extension reaction: A second chain extender is added to the modified prepolymer emulsion to form a chain extender mixture. The chain extender mixture is heated to 70°C and reacted for 0.5 h under stirring at 500 r / min to prepare the modified polyurethane coating liquid.

[0046] Preparation Examples 2-5 A modified polyurethane coating liquid differs from Preparation Example 1 in that the types and quality settings of the raw materials and the preparation process settings of the modified polyurethane coating liquid are different, as shown in Tables 1-2.

[0047] Table 1 lists the types and quality settings of raw materials for the modified polyurethane coating liquids in Examples 1-5. In Preparation Examples 1-2, the average molecular weight of the hydroxyl-terminated polydimethylsiloxane was 1500; in Preparation Examples 3-5, the average molecular weight of the hydroxyl-terminated polydimethylsiloxane was 1000; and in Preparation Example 5, the average molecular weight of the hydroxyl-terminated polydimethylsiloxane was 2000.

[0048] Table 2 lists the preparation process settings for the modified polyurethane coating liquids in Examples 1-5. Preparation Example 6 A modified polyurethane coating liquid differs from Preparation Example 1 in that it uses polyoxyethylene glycerol in an equal amount to replace ether polycaprolactone triol.

[0049] Preparation Example 7 A modified polyurethane coating liquid differs from Preparation Example 1 in that: polyoxyethylene glycerol is used to replace ether polycaprolactone triol in equal amounts; diphenylmethane diisocyanate is used to replace dimethyl biphenyl diisocyanate in equal amounts; and polyethylene glycol 1500 is used to replace polytetrahydrofuran diol in equal amounts.

[0050] Preparation Examples 8-12 A modified polyurethane coating liquid differs from Preparation Example 1 in that the raw materials of the modified polyurethane coating liquid also include fillers and leveling agents, and the types and weight settings of the fillers and leveling agents are shown in Table 3. The difference between preparation examples 8-12 lies in the different types and weight settings of the raw materials for the filler and leveling agent, as detailed in Table 3.

[0051] Preparation of modified polyurethane coating liquid containing filler and leveling agent: After stirring the filler, leveling agent and modified polyurethane coating, the mixture is poured into a sand mill and ground for 1 hour to prepare the modified polyurethane coating liquid containing filler and leveling agent.

[0052] Table 3 lists the types and weights of fillers and leveling agents in the modified polyurethane coating liquids of Preparation Examples 8-12. Preparation Example 13 A modified polyurethane coating liquid differs from Preparation Example 8 in that: polyethylene glycol with a molecular weight of 800 is used in an equal amount to replace polyethylene glycol with a molecular weight of 1500; and diatomaceous earth with a particle size of 80 μm is used in an equal amount to replace diatomaceous earth with a particle size of 48 μm.

[0053] Preparation Example 14 A modified polyurethane coating liquid differs from Preparation Example 8 in that: polyethylene glycol with a molecular weight of 3000 is used in an equal amount to replace polyethylene glycol with a molecular weight of 1500; and diatomaceous earth with a particle size of 30 μm is used in an equal amount to replace diatomaceous earth with a particle size of 48 μm.

[0054] Preparation Example 15 A modified polyurethane coating liquid, which differs from Preparation Example 8 in that an acrylic leveling agent GLP588 is used in an equal amount to replace the silicone-based BYK-333.

[0055] Example 1 A moisture-proof, waterproof, and environmentally friendly decorative fabric, the raw material composition of which is shown in Table 4, and the preparation process is as follows: The modified polyurethane coating liquid prepared in step 1 was applied to the decorative fabric and dried at 60°C for 10 hours to obtain a decorative fabric with a modified polyurethane coating. The thickness of the modified polyurethane coating was 0.2 mm.

[0056] Examples 2-6 A moisture-proof, waterproof, and environmentally friendly decorative fabric differs from Example 1 in that the types of modified polyurethane coating liquid and decorative fabric are different, and the film-forming conditions and thickness of the modified polyurethane coating are different, as detailed in Table 4.

[0057] Table 4 lists the types of modified polyurethane coating liquids and decorative fabrics used in Examples 1-6, along with the film-forming conditions and thickness settings for the modified polyurethane coatings. Modified polyurethane coating liquid Preparation Example 1 Preparation Example 2 Preparation Example 3 Preparation Example 1 Preparation Example 1 Preparation Example 1 Decorative Fabric Polyester Cotton 100% cotton All hair Full polyester Polyester Cotton Polyester Cotton Drying temperature / ℃ 40 50 60 40 40 40 Drying time / h 10 13 15 10 10 10 Thickness of modified polyurethane coating / mm 0.2 0.25 0.3 0.2 0.4 0.1 Examples 7-18 A moisture-proof, waterproof, and environmentally friendly decorative fabric differs from Example 1 in that the modified polyurethane coating liquid is sequentially used from the modified polyurethane coating liquids prepared in Examples 4-15.

[0058] Comparative Example Comparative Example 1 A moisture-proof, waterproof, and environmentally friendly decorative fabric differs from Example 1 in that the modified polyurethane coating liquid does not use triols in its raw materials; no grafting reaction step is set; and in the preparation step of the polyurethane prepolymer, hydroxyl-terminated polydimethylsilane and the first chain extender are added together with the diol.

[0059] Comparative Example 2 A moisture-proof, waterproof, and environmentally friendly decorative fabric differs from Example 1 in that the modified polyurethane coating liquid does not use triols, hydroxyl-terminated polydimethylsilane, and the first chain extender in its raw materials, and does not include a grafting reaction step.

[0060] Performance testing Test 1: Moisture permeability test method: The moisture permeability of the moisture-proof, waterproof and environmentally friendly decorative fabric is tested according to GB / T12704.2-2009-B, and the test temperature is set to 38℃.

[0061] Moisture permeability (WVP) is calculated using the following formula: WVP=(M1-M2)×24 / (T*S) In the formula: WVP is the moisture permeability, in g / (m³). 2 ·d); M1-M2 represents the mass change in the permeation cup (in grams), and T represents the test time (in days). S is the area of ​​the mouth of the permeable cup (unit: m²). 2 ).

[0062] Test samples: The moisture-proof, waterproof and environmentally friendly decorative fabrics of Examples 1-18 were used as test samples, and the moisture-proof, waterproof and environmentally friendly decorative fabrics of Comparative Examples 1-2 were used as control samples.

[0063] Test 2: Hydrostatic pressure test method: The test was conducted in accordance with GB / T4744-2013 using a YG825E-20 digital water permeability tester manufactured by Ningbo Textile Instrument Factory.

[0064] Test samples: The moisture-proof, waterproof and environmentally friendly decorative fabrics of Examples 1-18 were used as test samples, and the moisture-proof, waterproof and environmentally friendly decorative fabrics of Comparative Examples 1-2 were used as control samples.

[0065] Test 3: Scrub Resistance Test Method: Conducted according to GB / T9266-2009 Determination of Scrub Resistance of Coatings. Fix the test sample onto the test template, and use a scrubbing machine to scrub the test sample, recording the number of scrubbing cycles.

[0066] Test samples: The moisture-proof, waterproof and environmentally friendly decorative fabrics of Examples 1-18 were used as test samples, and the moisture-proof, waterproof and environmentally friendly decorative fabrics of Comparative Examples 1-2 were used as control samples.

[0067] Test results: The moisture permeability, water pressure resistance and washability of the moisture-proof and waterproof environmentally friendly decorative fabrics of Examples 1-18 and Comparative Examples 1-2 are shown in Table 5.

[0068] Table 5 lists the test results of moisture permeability, water pressure resistance, and washability of the moisture-proof and waterproof environmentally friendly decorative fabrics of Examples 1-18 and Comparative Examples 1-2. Combining Examples 1-18 and Comparative Examples 1-2 with Table 5, it can be seen that: The moisture-proof, waterproof, and environmentally friendly decorative fabrics of Examples 1-14 have significantly better moisture permeability (1423-1688 g / (m2·d)), water pressure resistance (46-67 kPa), and washability (3100-4400 times) than the moisture-proof, waterproof, and environmentally friendly decorative fabrics of Comparative Examples 1-2.

[0069] This indicates that by adding triols to the raw materials of the modified polyurethane coating liquid, side chains are introduced into the molecular chains of the waterborne polyurethane, and then siloxane groups are introduced into the side chains. During the formation of the polyurethane coating film, the siloxane group side chains gather on the surface of the polyurethane coating, enhancing the waterproof performance of the coating. Furthermore, diols, isocyanates, and triols are preferred, and fillers and organosilicon leveling agents are added to the raw materials of the modified polyurethane coating liquid, so that the decorative fabric with polyurethane coating has excellent waterproof, breathable, and moisture-proof properties.

[0070] The test results of Examples 5-6 and Examples 1-3 show that: if the modified polyurethane coating is too thick, the moisture permeability of the decorative fabric with the polyurethane coating decreases; if the modified polyurethane coating is too thin, the water pressure resistance of the decorative fabric with the polyurethane coating decreases; and if the modified polyurethane coating is too thin or too thick, the washability decreases. This may be because if the modified polyurethane coating is too thick, the path for water vapor to pass through the coating is longer, resulting in decreased air permeability; if the coating is too thin, the protection is insufficient, resulting in decreased water resistance. The decrease in washability due to both thin and thick modified polyurethane coatings may be because if the modified polyurethane coating is too thick, the cohesive force between the coatings is too large, making the modified polyurethane coating more prone to cracking under external force, leading to decreased washability; while if the modified polyurethane coating is too thin, the bonding force between the coatings is insufficient, also resulting in decreased washability.

[0071] Compared with Examples 16-17, Examples 11-15 exhibit better moisture permeability, water pressure resistance, and washability. This indicates that under the condition of a fixed amount of leveling agent, optimizing the particle size of the filler and the molecular weight of polyvinyl alcohol can further improve the moisture permeability, water pressure resistance, and washability of the moisture-proof, waterproof, and environmentally friendly decorative fabric. This may be because if the particle size of the filler is too large or the molecular weight of the polyvinyl alcohol is too small, it is not conducive to the filler entering the soft segment microcrystalline region of polyurethane, resulting in poor synergistic effect between the filler and polyurethane molecules. If the particle size of the filler is too small, it is prone to agglomeration. If the molecular weight of the polyvinyl alcohol is too large, the gap between it and the filler is large, resulting in poor synergistic effect. Optimizing the molecular weight of polyvinyl alcohol and the particle size of the filler can further improve the waterproof, moisture permeability, and washability of the decorative fabric with a polyurethane coating.

[0072] This specific embodiment is merely an explanation of this application and is not intended to limit it. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of this application.

Claims

1. A moisture-proof, waterproof, and environmentally friendly decorative fabric, characterized in that, It includes a decorative fabric and a modified polyurethane coating, wherein the modified polyurethane coating is formed by applying a modified polyurethane coating liquid onto the decorative fabric; The modified polyurethane coating liquid, by weight, comprises the following raw materials: Isocyanate 211-635 parts; Diols 46-900 parts; 12-81 parts of triol; 32-39 parts of polyhydroxycarboxylic acids; The first chain extender is 7.2-85.1 parts; 180-300 parts of hydroxyl-terminated polydimethylsiloxane; The second chain extender is 7.2-85.1 parts; Triethylamine 23-27 parts; 50-80 parts acetone; 1000-2000 parts water; The isocyanate is one of diphenylmethane diisocyanate, dimethylbiphenyl diisocyanate, and hexamethylene diisocyanate; The diol is one of polyethylene glycol, diethylene glycol, polytetrahydrofuran glycol, 1,2-propanediol, 1,5-pentanediol, and 1,6-hexanediol; The triol is polycaprolactone triol; The first chain extender and the second chain extender are ethylenediamine or isophorone diamine; The polyhydroxycarboxylic acid is dimethylolpropionic acid or dimethylolbutyric acid; The preparation steps of the modified polyurethane coating liquid are as follows: Preparation of polyurethane prepolymer: Diol and triol are mixed to form a mixture. The temperature of the mixture is raised to 70-90℃. Isocyanate is added under nitrogen protection and stirring at 300-500r / min. The reaction is carried out for 0.6-1.2h to obtain polyurethane prepolymer. Grafting reaction: Hydroxyl-terminated polydimethylsiloxane and the first chain extender are added to the polyurethane prepolymer, and the reaction is continued to be stirred for 0.6-1.2 h to prepare the modified prepolymer; Salt formation: Add polyhydroxycarboxylic acid to the modified prepolymer, stir and react for 1.5-2.5 h, then lower the temperature to 40-50℃, add acetone, then add triethylamine, and react for 0.5-1 h to prepare the modified prepolymer salt; Emulsification: Water is added to the prepared modified prepolymer salt under stirring at 1000-1500 r / min to prepare a modified prepolymer emulsion; Chain extension reaction: Add a second chain extender to the modified prepolymer emulsion, raise the temperature to 70-90℃, and react for 0.5-1h under stirring at 300-500r / min to prepare the modified polyurethane coating liquid.

2. The moisture-proof, waterproof, and environmentally friendly decorative fabric according to claim 1, characterized in that: The isocyanate is diphenylmethane diisocyanate; the diol is polyethylene glycol.

3. The moisture-proof, waterproof, and environmentally friendly decorative fabric according to claim 1, characterized in that: The modified polyurethane coating liquid also includes 10-30 parts of filler and 10-20 parts of leveling agent as raw materials, wherein the filler is one of diatomaceous earth, kaolin, or montmorillonite.

4. The moisture-proof, waterproof, and environmentally friendly decorative fabric according to claim 3, characterized in that: The leveling agent is an organosilicon leveling agent, and the filler has a particle size of 48-58 μm.

5. The moisture-proof, waterproof, and environmentally friendly decorative fabric according to claim 4, characterized in that: The silicone leveling agent is one of BYK-333, BD-3055, BD-3033, and BD-3053.

6. The moisture-proof, waterproof, and environmentally friendly decorative fabric according to claim 1, characterized in that: The decorative fabric is made of pure cotton, polyester-cotton blend, wool-polyester blend, or pure wool.

7. A preparation process for the moisture-proof, waterproof, and environmentally friendly decorative fabric according to any one of claims 1-6, characterized in that, A modified polyurethane coating liquid is applied to a decorative fabric and then dried at 40-60℃ for 10-15 hours to obtain a decorative fabric with a modified polyurethane coating. The thickness of the modified polyurethane coating is 0.2-0.3 mm.

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